PARTIAL: typofixes (found by misspell_fixer)

Upstream: 9f68ed6b6d1a9c6436ce37913666165f2b180ee3 (PR #6539)

src/policy/fees.cpp

@@ -261,7 +261,7 @@ void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHe
         blocksAgo = 0;
     if (blocksAgo < 0) {
         LogPrint("estimatefee", "Blockpolicy error, blocks ago is negative for mempool tx\n");
-        return;  //This can't happen becasue we call this with our best seen height, no entries can have higher
+        return;  //This can't happen because we call this with our best seen height, no entries can have higher
     }
 
     if (blocksAgo >= (int)unconfTxs.size()) {

src/policy/fees.h

@@ -118,7 +118,7 @@ public:
     /**
      * Initialize the data structures.  This is called by BlockPolicyEstimator's
      * constructor with default values.
-     * @param defaultBuckets contains the upper limits for the bucket boundries
+     * @param defaultBuckets contains the upper limits for the bucket boundaries
      * @param maxConfirms max number of confirms to track
      * @param decay how much to decay the historical moving average per block
      * @param dataTypeString for logging purposes